code: def test_decimal_dtype_arrow_roundtrip(decimal_type):
      dt = decimal_type(4, 2)
      assert dt.to_arrow() == pa.decimal128(4, 2)
      assert dt == decimal_type.from_arrow(pa.decimal128(4, 2))
  
imports: import numpy
  import pandas
  import pyarrow
  import pytest
  import cudf
  from cudf.core._compat import PANDAS_GE_150
  from cudf.core.column import ColumnBase
  from cudf.core.dtypes import CategoricalDtype, Decimal32Dtype, Decimal64Dtype, Decimal128Dtype, IntervalDtype, ListDtype, StructDtype
  from cudf.testing._utils import assert_eq
  from cudf.utils.dtypes import np_to_pa_dtype
label_desc: Use image node_id 10 for calling a global function with example usage: test_decimal_dtype_arrow_roundtrip(decimal_type) without return types